Continual knocking on port 443 from foreign IP address Post: 302893863

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Special Forums Cybersecurity Continual knocking on port 443 from foreign IP address Post 302893863 by Perderabo on Friday 21st of March 2014 11:26:36 AM

03-21-2014

Administrator Emeritus

Quote:

Originally Posted by randomxs

Why would someone continually try to access the https port for months on end 100s of times an hour when clearly they must see they are being denied access to the server?

Iptables is not perfect and even when you use DROP rather than REJECT a port scanner can tell that DROP is in use by doing a SYN scan. If a server is on the port the SYN will get an ACK, otherwise it gets a RST. So the bad guy knows that he is getting nailed by a DROP rule and there is a live server being protected by the DROP rule. So he sets up an infinite loop trying to connect.

He hopes you will someday have a problem, wonder if iptables is causing it, and try dropping iptables just for a few seconds. Or maybe you will change your configuration and do a quick "service iptables restart". Most iptable configs allow ESTABLISHED connections to persist so once he connects... he is in.

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LEARN ABOUT REDHAT

drop_database

DROP 
DATABASE(7)						   SQL Commands 						  DROP DATABASE(7)

NAME

       DROP DATABASE - remove a database

SYNOPSIS

       DROP DATABASE name

   INPUTS
       name   The name of an existing database to remove.

   OUTPUTS
       DROP DATABASE
	      This message is returned if the command is successful.

       DROP DATABASE: cannot be executed on the currently open database
	      You  cannot  be connected to the database you are about to remove.  Instead, connect to template1 or any other database and run this
	      command again.

       DROP DATABASE: may not be called in a transaction block
	      You must finish the transaction in progress before you can call this command.

DESCRIPTION

       DROP DATABASE removes the catalog entries for an existing database and deletes the directory containing the data.  It can only be  executed
       by the database owner (usually the user that created it).

       DROP DATABASE cannot be undone. Use it with care!

   NOTES
       This  command  cannot  be executed while connected to the target database. Thus, it might be more convenient to use the shell script dropdb
       [dropdb(1)], which is a wrapper around this command, instead.

       Refer to CREATE DATABASE [create_database(7)] for information on how to create a database.

COMPATIBILITY

   SQL92
       DROP DATABASE statement is a PostgreSQL language extension; there is no such command in SQL92.

SQL - Language Statements					    2002-11-22							  DROP DATABASE(7)